diff --git a/swh/model/model.py b/swh/model/model.py
--- a/swh/model/model.py
+++ b/swh/model/model.py
@@ -743,7 +743,9 @@
     id = attr.ib(type=Sha1Git, validator=type_validator(), default=b"", repr=hash_repr)
 
     def _compute_hash_from_attributes(self) -> bytes:
-        return _compute_hash_from_manifest(git_objects.snapshot_git_object(self))
+        return _compute_hash_from_manifest(
+            git_objects.snapshot_git_object(self, ignore_unresolved=True)
+        )
 
     @classmethod
     def from_dict(cls, d):
diff --git a/swh/model/tests/test_identifiers.py b/swh/model/tests/test_identifiers.py
--- a/swh/model/tests/test_identifiers.py
+++ b/swh/model/tests/test_identifiers.py
@@ -755,8 +755,9 @@
         )
 
     def test_unresolved(self):
-        with self.assertRaisesRegex(ValueError, "b'foo' -> b'bar'"):
-            Snapshot.from_dict(remove_id(self.unresolved))
+        self.assertEqual(
+            Snapshot.from_dict(remove_id(self.unresolved)).id, self.unresolved["id"]
+        )
 
     def test_git_object_unresolved(self):
         with self.assertRaisesRegex(ValueError, "b'foo' -> b'bar'"):